/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.metadata.tagSchemaRegion.tagIndex.memtable;

import java.util.HashMap;
import java.util.Map;

/**
 * used to manage working and immutableMemTables
 */
public class MemTableGroup {

    // the maximum number of device ids managed by a working memTable
    private int numOfDeviceIdsInMemTable;

    // (maxDeviceID / numOfDeviceIdsInMemTable) -> MemTable
    private Map<Integer, MemTable> immutableMemTables;

    private MemTable workingMemTable;

    // the largest device id saved by the current MemTable
    private int maxDeviceID;

    public MemTableGroup() {
    }

    public MemTableGroup(int numOfDeviceIdsInMemTable) {
        this.numOfDeviceIdsInMemTable = numOfDeviceIdsInMemTable;
        workingMemTable = new MemTable(MemTable.WORKING);
        immutableMemTables = new HashMap<>();
        maxDeviceID = 0;
    }

    public int getNumOfDeviceIdsInMemTable() {
        return numOfDeviceIdsInMemTable;
    }

    public void setNumOfDeviceIdsInMemTable(int numOfDeviceIdsInMemTable) {
        this.numOfDeviceIdsInMemTable = numOfDeviceIdsInMemTable;
    }

    public Map<Integer, MemTable> getImmutableMemTables() {
        return immutableMemTables;
    }

    public void setImmutableMemTables(Map<Integer, MemTable> immutableMemTables) {
        this.immutableMemTables = immutableMemTables;
    }

    public MemTable getWorkingMemTable() {
        return workingMemTable;
    }

    public void setWorkingMemTable(MemTable workingMemTable) {
        this.workingMemTable = workingMemTable;
    }

    public int getMaxDeviceID() {
        return maxDeviceID;
    }

    public void setMaxDeviceID(int maxDeviceID) {
        this.maxDeviceID = maxDeviceID;
    }

    /**
     * determine whether the id can be saved to the current MemTable
     *
     * @param id INT32 device id
     * @return return true if it can, otherwise return false
     */
    public boolean inWorkingMemTable(int id) {
        return id / numOfDeviceIdsInMemTable == maxDeviceID / numOfDeviceIdsInMemTable;
    }

    @Override
    public String toString() {
        return "MemTableGroup{"
                + "numOfDeviceIdsInMemTable="
                + numOfDeviceIdsInMemTable
                + ", immutableMemTables="
                + immutableMemTables
                + ", workingMemTable="
                + workingMemTable
                + ", maxDeviceID="
                + maxDeviceID
                + '}';
    }
}
